Automatic merge from submit-queue

Add NODE_NAME to started.json.

Sometimes a single Jenkins node gets borked. Lets upload what node we're on before running tests. See [this list of env vars that Jenkins sets for us.](https://wiki.jenkins-ci.org/display/JENKINS/Building+a+software+project#Buildingasoftwareproject-JenkinsSetEnvironmentVariables) I think this info should be added to gubernator.